81028: Invalid wait URL in Studio widget

The wait URL configured in an Enqueue Call or Send To Flex widget wasn't a valid absolute URL after Liquid template interpolation. The wait URL has been omitted from the Enqueue TwiML, and the call will proceed with the default hold music.

• The wait URL contains Liquid template variables that resolved to an invalid absolute URL at execution time.
• The wait URL is a relative path (for example, hold-music.mp3 or /hold-music.mp3) instead of a fully qualified URL.
• The wait URL contains invalid characters such as spaces or unencoded special characters.

• Ensure the wait URL is a fully qualified absolute URL including the protocol (for example, https://example.com/hold-music.mp3).
• Verify the runtime data of your flow execution by checking the Flow Data and inspecting any variables referenced in the wait URL.
• Check the Liquid template syntax used in the wait URL field.
• Ensure that all query parameters in the wait URL are properly URL-encoded. If you are using Liquid to construct the URL, you can use the url_encode filter to encode any dynamic values. For example: https://example.com/hold-music.mp3?caller={{contact.channel.address | url_encode}}.